Anisotropic failure criterion for evaluation of local necking after nonlinear deformation history in sheet metal forming processes

用于评估板材成形过程中非线性变形历史后局部颈缩的各向异性失效准则

基本信息

项目摘要

The prediction of formability is one of the most important tasks in sheet metal process simulation. The common criterion in industrial applications is the Forming Limit Curve (FLC). The big advantage of FLCs is the easy interpretation of simulation or measurement data in combination with an ISO standard for the experimental determination. However, the conventional FLCs are limited to almost linear and unbroken strain paths, i.e. deformation histories with non-linear strain increments often lead to big differences in comparison to the prediction of the FLC. Volk published a phenomenological approach, the so-called Generalized Forming Limit Concept (GFLC), to predict the localized necking on arbitrary deformation history with unlimited number of non-linear strain increments. Anisotropic material behavior is not considered in the GFLC so far.The main focus of the proposed research project is the experimental characterization of the forming limits depending on the rolling direction (anisotropy) and the forming history. The experiments will be performed mainly on the universal testing machine BUP1000, funded by DFG (INST 95/1268-1). Based on the experimental database a parameterization of the strain paths and an expansion of the metamodel with the anisotropic material behavior takes place. Finally, the identification of the material influence on the developed procedure and derive of a scaling approach for material families complete the research project.The expected results enable the evaluation of non-linear strain path by the consideration of anisotropic material behavior.
成形性预测是板料成形模拟的重要内容之一。在工业应用中的通用标准是成形极限曲线(FLC)。FLC的最大优势是结合ISO标准对模拟或测量数据进行简单的解释。然而,传统的FLC仅限于几乎线性和不间断的应变路径,即具有非线性应变增量的变形历史与FLC的预测相比往往导致很大的差异。Volk提出了一种唯象的方法,即广义成形极限概念(Generalized Forming Limit Concept,GFLC),用于预测任意变形历史下的局部颈缩。目前GFLC还没有考虑各向异性材料的行为,本研究项目的主要重点是根据轧制方向(各向异性)和成形历史对成形极限进行实验表征。实验将主要在DFG(INST 95/1268-1)资助的通用试验机BUP 1000上进行。基于实验数据库的参数化的应变路径和扩展的元模型与各向异性材料的行为发生。最后,通过对材料影响的识别和对材料族尺度方法的推导,完成了本课题的研究,预期的结果使得通过考虑各向异性材料行为来评估非线性应变路径成为可能。

项目成果

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Professor Dr.-Ing. Wolfram Volk其他文献

Professor Dr.-Ing. Wolfram Volk的其他文献

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{{ truncateString('Professor Dr.-Ing. Wolfram Volk', 18)}}的其他基金

Development of a material model for gas generation in inorganic foundry sands
无机铸造砂中气体产生的材料模型的开发
  • 批准号:
    445163571
  • 财政年份:
    2020
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Analysis of bonding mechanisms in iron copper compound casting products
铁铜复合铸造制品结合机理分析
  • 批准号:
    407354049
  • 财政年份:
    2018
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Experimental investigation of arbitrary non-linear load paths using a feedback controller in combination with a conventional sheet metal testing machine and a special tool for cruciform specimens
使用反馈控制器结合传统钣金试验机和十字形样品专用工具对任意非线性载荷路径进行实验研究
  • 批准号:
    389864979
  • 财政年份:
    2018
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Prediction of Core Fracture during Decoring of Cast Components
铸件装饰过程中型芯断裂的预测
  • 批准号:
    401764392
  • 财政年份:
    2018
  • 资助金额:
    --
  • 项目类别:
    Research Grants
New experimental approach for yield loci determination using a modified Nakajima setup
使用修改后的 Nakajima 设置确定产量位点的新实验方法
  • 批准号:
    363839128
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Thermomechanical interaction in the shear cutting affected zone
剪切影响区的热机械相互作用
  • 批准号:
    360148869
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Improvement of the high strain rate superplasticity of aluminum materials by equal channel angular pressing of sheet metals
板材等通道角冲压改善铝材高应变率超塑性
  • 批准号:
    376797652
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Robust Scaling of Roller Clinching Processes
滚子铆接工艺的稳健扩展
  • 批准号:
    323223081
  • 财政年份:
    2016
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
Manufacturing of Electromagnetic Components out of Electrical Steel Sheets
用电工钢板制造电磁元件
  • 批准号:
    255711578
  • 财政年份:
    2014
  • 资助金额:
    --
  • 项目类别:
    Research Units
Lubricant-free Forming by Affecting Thermoelectric Currents
通过影响热电流实现无润滑成型
  • 批准号:
    244839924
  • 财政年份:
    2013
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes

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